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Derivative And Hedging Activities (Details 1) (Interest rate swaps [Member], Cash flow hedges [Member], USD $)
In Thousands
6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Gains and losses recognized on the Corporation's derivative instruments designated as cash flow hedges    
Amount of Gain /(Loss) Recognized in OCI on Derivatives (Effective Portion) $ (374) $ (3,952)
Interest expense short term borrowings [Member]
   
Gains and losses recognized on the Corporation's derivative instruments designated as cash flow hedges    
Amount of (Gain)/ Loss Reclassified from AOCI into Income (Effective Portion) 2,962 3,000
Amount of Gain /(Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ (6) $ (3)